Mr. T. Davidson on the Brachiopoda. 441 



touching each other by their angles, but which left here and 

 there free spaces. After having dried up these remains of the 

 animal on the slide of the microscope, their granulations had 

 not changed in appearance, but seemed to us of a calcareous 

 nature : one may compare these membranaceous parts furnished 

 with calcareous granulations to the skin of certain star-fish, but 

 the granulations in Morrisia do not present regular shapes, nor 

 are they symmetrical in their arrangement." 



These facts are of great value (as justly stated by M. Suess) 

 in helping us to understand that beautiful calcareous network 

 which is observed in the interior of many species of Thecidium. 



5. Waldheimia septigera, Loven, sp. PI. X. f. 1, 



Terebratida septigera, Loven, Index Moll. Scand. p. 29, 1846. 

 Waldheimia septigera, Catalogue of the MoUusca in the British 

 Museum, p. 59. 1853. 



Shell inequivalve, tumid, ovato-triangular or somewhat ob- 

 scurely pentagonal, truncated in front; colour almost white, 

 subpellucid, smooth, marked only by a few lines of growth. 

 Beak moderately produced, slightly incurved and obliquely 

 truncated by a circular foramen of moderate dimensions, partly 

 completed by and separated from the hinge-line by a deltidium 

 in two pieces ; beak-ridges well defined. The smaller or dorsal 

 valve is not so deep as the opposite one, the convexity origin- 

 ating at the umbone continued by a gentle curve until it 

 attains about the centre of the valve, when the remaining half 

 declines more rapidly, and especially when approaching to the 

 front, producing a slight medio-longitudinal convexity, with a 

 moderate depression on either side ; the two lateral portions of 

 the valve presenting more elevated rounded cunes. The larger 

 or ventral valve, on the contrary, is biplicated, the mesial con- 

 cavity coiTcsponding with the median convexity of the opposite 

 valve. The simple attached reflected loop extends to about 

 three-quarters of the length of the shell; a median septum 

 exists along the bottom of the valve, whose presence is betrayed 

 by a dark line on the outer surface of the valve. Length 12, 

 width 9, depth about 7 lines. 



Hab. Norway : Finmark. 



Obs. This remarkable shell (named by Loven in his Index 

 Moll. Scand.) does not appear to have been hitherto figured or 

 sufficiently described. It seems rare, since the only example 

 with which I am acquainted, and from which the above de- 

 scription and illustrations are taken, was originally in the 

 possession of Mr. Hanley, who, in the most liberal manner. 



